3.3.1.5.5 Primary and Secondary Endpoint Address
Primary and Secondary Endpoint Addresses ([C706] section 9.3.3.2) allows a server to have a primary and secondary endpoint address. These extensions recognize the syntactic rules associated with a primary and secondary endpoint address, but they discard all semantic meaning of a primary and secondary endpoint address. Servers that implement these extensions SHOULD return a secondary endpoint address that is the same as the primary endpoint address. Clients that implement these extensions SHOULD ignore the secondary endpoint address. Implementations of this protocol MUST conform to [C706] with respect to transmitting, storing, and failure handling of the secondary endpoint. Clients SHOULD ignore secondary endpoints that the server returns.